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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').

22285 results found.

  1. GRB000615: H-band observations
  2. GRB990308, HST/STIS observations of the host galaxy
  3. GRB000620 - Optical observations
  4. GRB000620 Optical observations
  5. GRB000620: BeppoSAX WFC and GRBM detection
  6. GRB000607, optical observations
  7. GRB 000615: NIR further observations
  8. GRB990123, HST/STIS observations of the host galaxy
  9. GRB000616 optical observations
  10. GRB 000615, near-infrared observations
  11. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  12. GRB000615, further R-band photometry
  13. GRB 000615: NIR observations
  14. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  15. GRB000615, R-band photometry
  16. The Hosts of GRB 980703 and GRB 971214
  17. GRB 000301C: Further Late-Time HST/STIS observations
  18. GRB000528: follow-up X-ray measurements and update of IPN annulus
  19. GRB980519, HST/STIS observations of the host galaxy
  20. GRB000604 optical non-detection
  21. GRB000604 - Optical observations
  22. GRB000604, optical observations
  23. GRB000528, optical observations at ESO
  24. GRB 000604 optical observations
  25. GRB 000418: Detection of the Host Galaxy
  26. GRB000604, optical observations, comparison with DPOSS
  27. GRB000528, Radio Observations
  28. X-ray Afterglow of GRB 000529
  29. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  30. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  31. GRB 000528 - WFC measurements
  32. GRB000519, BVRI field photometry
  33. IPN triangulation of GRB000519
  34. GRB000508B, optical photometry
  35. GRB000508B, BVR field photometry
  36. Possible GRB-related phenomenon
  37. RXTE/ASM and IPN localization of GRB 000508B
  38. GRB000424, UBVRI field photometry
  39. GRB000418, UBVRI field photometry update
  40. GRB000424, optical observations
  41. GRB 000429, optical observation
  42. GRB 000429, UBVRI field photometry
  43. GRB 000418, UBVRI field photometry
  44. GRB 000418, optical observation
  45. GRB 000418, Optical Observation
  46. GRB000418, near-infrared observations
  47. Correction to IPN error box for GRB000419
  48. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  49. GRB000416 BRJK observations
  50. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  51. GRB 000408, optical observations
  52. GRB 991208, UBVRI field photometry
  53. GRB000408, lotis optical observations
  54. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  55. GRB000301C - Addendum to GCN 623
  56. GRB 000323, optical observations
  57. GRB 000326: Optical Observations
  58. GRB000326, Radio observations
  59. GRB000313, Radio observations
  60. GRB 000313 - optical transient in the BATSE error box
  61. GRB 000307, Optical Observations
  62. GRB 000307, BVRI Field Photometry
  63. GRB 000301C: A Precise Redshift Determination
  64. GRB 000301C, Optical Observation
  65. GRB 000301C: HST/STIS CCD Imaging of the field
  66. IPN error box for GRB000307
  67. GRB000301C, optical R-band observations
  68. GRB 000301C Optical Observations
  69. GRB 000301C: K' Observations
  70. GRB000301C OT candidate optical observations
  71. GRB000301C - Host galaxy not detected in R (?)
  72. Optical observations of GRB000301c
  73. GRB000301C, Radio observations
  74. GRB000301C, Radio observations
  75. GRB000301C, near-infrared observations (JHK' imaging)
  76. GRB 000301c near-IR observations
  77. GRB 000301C, UBVRI field photometry
  78. GRB 000301C: OT confirmed
  79. GRB000301c optical observations
  80. GRB000301C, optical observations
  81. GRB000301C
  82. GRB 000301C : Optical Candidate
  83. GRB000301C: RXTE/ASM and IPN localizations
  84. GRB000226 [IPN Position]
  85. HST Observations of GRB 990712
  86. GRB 000214 near-IR observations
  87. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  88. GRB000210, Radio Observations
  89. GRB 000115, BVRI field photometry
  90. GRB000214: BeppoSAX GRBM and WFC Detection
  91. Optical observations of GRB000210
  92. GRB000210 X-ray afterglow
  93. GRB000214: X-ray afterglow candidate
  94. GRB000214 refined BeppoSAX-WFC position
  95. GRB 000210: BATSE Observations
  96. Optical observations of the Chandra X-ray source for GRB000210
  97. GRB000210, Radio Observations
  98. IPN triangulation of GRB000210
  99. GRB000210: possible afterglow detection with BeppoSAX NFI
  100. GRB000201, Radio Observations

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